What does the Compound Interest Calculator do?
The Compound Interest Calculator shows how your money grows when interest earns interest over time. You choose a compounding frequency (annual, quarterly, or monthly), add monthly contributions if you invest regularly, and see a growth chart of your balance across the period.
Common uses
- Savings projection — see how a deposit balloons over years as interest compounds
- Contribution planning — add monthly contributions to model a recurring savings habit
- Frequency comparison — see how monthly compounding beats annual compounding over the same period
- FD and deposit checks — estimate maturity values by matching your bank's compounding schedule
Key features
- Multiple frequencies — choose annual, quarterly, or monthly compounding to match your deposit or loan
- Monthly contributions — add a fixed recurring amount to model a regular savings plan
- Growth chart — a year-by-year chart shows the balance climbing as interest-on-interest accelerates
How it works
Enter a starting principal, an annual interest rate, and a compounding frequency. Optionally add a fixed monthly contribution. Each period, the interest you earn is added to the balance, and the next period's interest is calculated on the new, larger amount. This compounding effect is why the later years of the growth chart rise much faster than the earlier ones.
Verdict
The Compound Interest Calculator makes the power of compounding visible — multiple frequencies, monthly contributions, and a growth chart that shows interest-on-interest at work.